Photographic developing apparatus.



No. 650,622. Patented May 29, I900.

R. UNGER.

PHOTOGRAPH") DEVELOPING APPARATUS.

(Application fllgd Sept. 14, 1399.

(No Model.)

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RUDOLPH UNGER, OF NEW YORK, N. Y.

PHOTOG RAPH IC DEVELOPING APPARATUS.

SPECIFICATION forming part of Letters Patent Ida 650,622, dated May 29, 1900. Application filed September 14, 399. Serial No. 730,408. (No model.)

To all whom it hung concern:

Be it known that I, RUDOLPH UNGER, a Cilizen of the United States, residing at New York, in the borough of Manhattan and State of New York, have invented certain new and useful Improvements in Photographic Plate- Holders and Developing-Boxes, of which the following is a specification.

This invention relates to photographic plateholders and developing-boxes, in which the primary object is to do away with the so-called dark room in developing negatives, whereby the developing process is rendered simpler and much less troublesome than heretofore. Ordinarily the developing is done in a dark room in which a lantern with a red or orange glass front is used. Under the present invention this lantern is done away with, as is also the dark room, as heretofore understood.

To these ends my invention consists,in combination, of a portable dark casin g which takes the place of the dark room and is provided with a slitted lid, a plate-holder provided with slides, between whichthe negative to be developed is placed, means for retaining the negative in position in the holder, openings or perforations for the outflowing of the developing solution from the plate-holder, and means'for guiding the plateholder into the dark casing, the said slides being guided through the slits of said casin g, all as will be fully described hereinafter and then particularly claimed. h

In the accompanying drawings, Figure l is an isometric perspective View of the plateholder made in accordance with my invention. Fig. 2 is a vertical longitudinal section of the same. Fig. 3 is an isometric perspective view of the plate-holder charged and containing its slides, one being partly open. Fig. 4 is a vertical longitudinal section of the latter. Fig. 5 is an isometric perspective view of the holder, both slides being closed. Fig. 6 is a vertical longitudinal section of the same. Fig. 7 is an isometric perspective view of the open dark casing, showing a filled plate-holder in position therein. Fig. 8 is an isometric perspective View of the closed dark casing, and Fig. 9 is a vertical central section of the same.

Similar letters of reference indicate corre- Spondin g parts.

'it has a flange a and at its front 'a flange a.

The top or upper end of the plate-holder is provided with two slits b 6, into which are slid the slides B B, provided at one end with handles h for manipulating them. The front slide B is guided along the inner side of the flange a and the rear slide B along the inner side of the flange a, said slides being thereby adapted to close the front and rear openings of the plate-holder. Said slides are prefer ably made, respectively, of red andorange glass, red being in front and orange behind, so as to be able to readily tell which is the front and which the back of the holder. The negative plate 0 is passed into the plateholder through the front opening, the slide B being pulled out for that purpose, so that the negative may be snapped into springcatches d d on opposite sides of the plateholder.

To permit the developing fluid to escape from the plate-holder, the latter is provided with a double-walled end opposite the slits b b, E being the inner wall and E the outer, said walls E and E being respectively provided with holes or perforations e and 6. These perforations eand e are out of alinement, so as to obstruct the passage of direct rays of light into the plate-holder. Along the sides of the plate-holder A are arranged longitudinal guide-ribs o The described plate-holder is used in connection with a portable dark casing F, of suitable metal or other material and of a size, for instance, twice that of the plate-holder. The dark casing F is closed by a flange-lid F, which is provided with slits ff, adjacent to which are strips or flaps J, of rubber or flexible material, which keep out any stray rays of light. In use the plate-holderis guided by its guide-ribs along guideways g g at opposite sides of the dark casing, and the handles of the slides project through the slits ff in the lid F, which may either be hinged or entirely removable.

The apparatus is used as follows: The plateholder is used in the photographic cam era in the usual Way in taking a negative on a sensitive plate. When the negative has been taken, the same and the plate-holder are placed in proper position in the dark casing, which contains a suitable quantity of developing liquid. The cover or lid F of the casing F is then placed on it, so that the handles of the slides B B will project through. The slide B at the sensitized side of the plate is then drawn either partly or entirely out, so as to permit the free access of the developer to the plate. The dark casing, with the contained plate-holder, is now turned or gently shaken, so that the developing liquid is caused to thoroughly and properly Wet and act on the sensitized surface of the negative. After a suitable time the lid F and plateholder are removed, the slides being closed. The operator can then see through the redglass slide the progress of development, the red glass intercepting the actinic light. If

I the development is not suflicient, the plateholder is placed back in the dark casing and the negative again subjected to the action of the developer. lVhen the development is complete, the negative is removed and fixed and Washed, as usual. The fixing should be done in another portable darkcasing containing the hypo. 1

Having thus described my invention, what I claim is- 1. The combination, with a portable dark casing, of a plate-holder removably arranged in said casing and provided with slides projecting through suitable slits of the casing, substantially as set forth.

2. The combination, with a portable dark casing, of a plate-holder removably arranged in said casing and provided With non-actinic glass slides projecting through suitable slits of the casing, substantially asset forth.

3. The combination, with a portable dark casing, having a lid or cover provided with slits, of a plate-holder removably arranged in said casing and provided with slides projecting through said slits, substantially as set forth.

4. The combination, With a portable dark casing, having a lid or cover and provided with guideways at opposite sides, of a plateholder guided in said ways, and provided with slides projecting through suitable slits in said lid, substantially as set forth.

5. The combination, With a portable dark casing, of a plate-holder constructed with double Walls provided with openings or perforations, out of line, and slides guided in oppositc sides of said plate-holder and projecting through suitable slits in the dark casing, substantially as set forth.

In testimony thatI claim the foregoing as my invention I have signed my name in presence of two subscribing Witnesses.

RUDOLPH UNGER.

Witnesses: Y

GEO. L. WHEELocn, M. H. WURTZEL. 

